ajout de directory.rs

src/filesys/directory.rs

@@ -0,0 +1,145 @@
+const FILE_NAME_MAX_LEN: i32 = 80;
+const NUM_DIR_ENTRIES: i32 = 30;
+
+use crate::kernel::mgerror::ErrorCode;
+use crate::kernel::mgerror::ErrorCode::{AlreadyInDirectory, NospaceInDirectory, InexistDirectoryError};
+use std::mem;
+pub struct DirectoryEntry {
+    in_use: bool,
+    sector: i32,
+    name: [char; FILE_NAME_MAX_LEN as usize],
+}
+
+pub struct Directory {
+    table_size: i32,
+    table: Vec<DirectoryEntry>,
+}
+
+impl Directory {
+    /// Initialize a directory; initially, the directory is completely
+    ///	empty.  If the disk is being formatted, an empty directory
+    ///	is all we need, but otherwise, we need to call FetchFrom in order
+    ///	to initialize it from disk.
+    ///
+    /// ### Parameters 
+    ///	- **size** is the number of entries in the directory
+    pub fn init_directory(size: i32) -> Directory {
+        let tmp:Vec<DirectoryEntry> = Vec::new();
+        for i in 0..size {
+            tmp[i as usize].in_use = false;
+        }
+        Directory { 
+            table_size: size, 
+            table: tmp,
+
+        }
+    }
+
+    pub fn fetch_from(&self, OpenFile file) {
+        file.read_at(self.table,self.table_size * mem::size_of::<DirectoryEntry>() as i32);
+    }
+
+    pub fn write_back(&self, OpenFile file) {
+        file.write_at(self.table,self.table_size * mem::size_of::<DirectoryEntry>() as i32);
+    }
+
+    /// Look up file name in directory.
+    ///      
+    /// return its location in the table of directory entries,
+    ///     ERROR if the name isn't in the directory.
+    ///
+    /// ### Parameters
+    ///	- **name** the file name to look up
+    pub fn find_index(&self, name: char) -> i32 {
+        for i in 0..self.table_size {
+            if self.table[i as usize].in_use && self.table[i as usize].name.starts_with(&self.table[i as usize].name) {
+                 return i;
+            }
+        }
+
+        return -1;
+    }
+
+    /// Look up file name in directory, and return the disk sector number
+    ///	where the file's header is stored. Return ERROR if the name isn't 
+    ///	in the directory.
+    ///
+    /// return the disk sector number where the file's header is stored 
+    ///              or ERROR if the name isn't in the directory. 
+    /// 
+    /// ### Parameters
+    /// 
+    ///	- **name** the file name to look up
+    pub fn find(&self, name: char) -> i32 {
+        let i = self.find_index(name);
+        if i != -1 {
+            return self.table[i as usize].sector;
+        }
+        return -1;
+    }
+
+    ///Add a file into the directory. 
+    ///
+    /// ### Parameters
+    /// - **name** the name of the file being added
+    /// - **new_sector** the disk sector containing the added file's header
+    /// 
+    /// return NO_ERROR, ALREADY_IN_DIRECTORY or NOSPACE_IN_DIRECTORY.
+    pub fn add(&self, name: char, new_sector: i32) -> ErrorCode {
+        if self.find_index(name) != -1 {
+            return AlreadyInDirectory;
+        }
+        for i in 0..self.table_size {
+            if !self.table[i as usize].in_use {
+                self.table[i as usize].in_use = true;
+                self.table[i as usize].name.starts_with(&self.table[i as usize].name);
+                self.table[i as usize].sector = new_sector;
+                return NoError;
+            }
+        }
+        return NospaceInDirectory;
+    }
+
+    /// Remove a file name from the directory. 
+    ///
+    /// ### Parameters
+    ///	- **name** the file name to be removed
+    /// return NO_ERROR, or INEXIST_DIRECTORY_ERROR
+    
+    pub fn remove(&self, name: char) -> ErrorCode{
+        let i = self.find_index(name);
+        if i == -1 {
+            return InexistDirectoryError;
+        }
+        self.table[i as usize].in_use = false;
+        return NoError;
+    }
+
+    /// List all the file names in the directory.(recursive function)
+    /// 
+    /// ### Parameters 
+    /// - **name** the name of the Dir to print
+    /// - **depth** the depth in the recursion (to print a nice hierarchy with spaces)
+    pub fn list(&self, name: char, depth: i32) {
+        let dir = Directory::init_directory(NUM_DIR_ENTRIES);
+
+        for i in 0..self.table_size {
+            if self.table[i as usize].in_use {
+                for j in 0..depth {
+                    if j<depth-3 {
+                        print!(" ");
+                    }else if j==depth-3 {
+                        print!("+");
+                    }else if j>depth-3 {
+                        print!("-");
+                    }
+                }
+                print!("{:#?}",self.table[i as usize].name);
+
+                
+            }
+        }
+    }
+
+
+}

src/filesys/filehdr.rs

@@ -1,4 +1,3 @@
-use crate::simulator::disk;
 use crate::{simulator::disk::SECTOR_SIZE, utility::bitmap::BitMap};
 pub const MAX_HEADER_SECTORS: i32 = 32;
 pub const DATAS_IN_FIRST_SECTOR: i32 = (SECTOR_SIZE - 5 * 8) /8; 
@@ -8,6 +7,11 @@ pub const MAX_FILE_LENGTH: i32 = ((MAX_DATA_SECTORS) * SECTOR_SIZE);
 
 use crate::DrvDisk;
 use crate::Disk;
+use crate::OpenFile;
+
+use std::mem;
+
+use super::openfile::OpenFile;
 
 pub struct FileHdr {
     is_dir: i32,
@@ -20,18 +24,19 @@ pub struct FileHdr {
 
 impl FileHdr { 
 
-    //Juste histoire d'avoir un constructeur, temporaire
-    pub fn new() -> FileHdr {
-        FileHdr{
-            is_dir : 0,
-            num_bytes : 0,
-            num_sectors : 0,
-            data_sectors : Vec::new(),
-            num_header_sectors : 0,
-            header_sectors : [0 ; MAX_HEADER_SECTORS as usize]
+
+    pub fn init_file_hdr() -> FileHdr {
+        FileHdr { 
+            is_dir: 0, 
+            num_bytes: 0, 
+            num_sectors: 0, 
+            data_sectors: Vec::new(), 
+            num_header_sectors: 0, 
+            header_sectors: [0;MAX_HEADER_SECTORS as usize],
         }
     }
 
+
     pub fn allocate(&mut self, mut free_map: BitMap, file_size: i32) -> bool {
         self.num_bytes = file_size;
         if file_size > MAX_FILE_LENGTH {
@@ -96,7 +101,14 @@ impl FileHdr {
         }
     }
 
-    //TODO: fetchFrom WriteBack
+    pub fn fetch_from(&self, file: OpenFile) {
+        file.read_at(self.table,self.table_size * mem::size_of::<DirectoryEntry>() as i32);
+    }
+
+    pub fn write_back(&self, file: OpenFile) {
+        file.write_at(self.table,self.table_size * mem::size_of::<DirectoryEntry>() as i32);
+    }
+
 
 
     pub fn byte_to_sector(&self,offset: i32) -> i32 {

src/filesys/openfile.rs

@@ -37,7 +37,7 @@ impl OpenFile {
     Creer un "fichier ouvert", charge le file_hdr depuis disk
      */
     pub fn open_file(sector : i32) -> OpenFile{
-        let file_hdr : FileHdr = FileHdr::new();
+        let file_hdr : FileHdr = FileHdr::init_file_hdr();
         let name : String = String::from("");
 
         //ici appel a fetchFrom(sector) sur file_hdr